<template>
   <div class="todo-footer">
        <label>
          <input type="checkbox" v-model="isAll"/>
        </label>
        <span>
          <span>已完成{{doneTotal}}</span> / 全部{{total}}
        </span>
        <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
      </div>
</template>

<script>
export default {
    name:'MyFooter',
    props:['todos'],
    computed:{
      total(){
        return this.todos.length
      },
      doneTotal(){
        // const x=this.todos.reduce(pre,current)=>{
        //   return pre+(current.done?1:0)
        // }
        return this.todos.reduce((pre,todo)=>pre+(todo.done?1:0),0)
      },
      isAll:{
        get(){
					return this.doneTotal === this.total && this.total > 0
				},
				//isAll被修改时set被调用
				set(value){
					// this.checkAllTodo(value)
					this.$bus.$emit('checkAllTodo',value)
				}
      }
    },
    methods: {
			/* checkAll(e){
				this.checkAllTodo(e.target.checked)
			} */
			//清空所有已完成
			clearAll(){
				// this.clearAllTodo()
				this.$emit('clearTodo')
			}
		},
}

</script>

<style scoped>
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>